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 ###Instrução: Quantos participantes houve em 2011?
 ###Tabelas: CREATE TABLE 1948_ladder (1948_ladder_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Wins INT, Losses INT, Draws INT, Against INT) CREATE TABLE 1931 (1931_id AUTO_INCREMENT PRIMARY KEY, Title VARCHAR, Series VARCHAR, Characters VARCHAR, Production Num. INT, Release date VARCHAR) CREATE TABLE composition_of_the_9th_seanad (composition_of_the_9th_seanad_id AUTO_INCREMENT PRIMARY KEY, Administrative Panel INT, Agricultural Panel INT, Cultural and Educational Panel INT, Industrial and Commercial Panel INT, Labour Panel INT, National University of Ireland INT, University of Dublin INT, Nominated by the Taoiseach INT, Total INT) CREATE TABLE list_of_chapters (list_of_chapters_id AUTO_INCREMENT PRIMARY KEY, Chapter VARCHAR, Chartered VARCHAR, School VARCHAR, State VARCHAR, Status VARCHAR, Charter Range VARCHAR) CREATE TABLE main_event_winners (main_event_winners_id AUTO_INCREMENT PRIMARY KEY, Year INT, Winner VARCHAR, Winning Hand VARCHAR, Prize Money VARCHAR, Entrants INT, Runner-Up VARCHAR, Losing Hand VARCHAR)  
SELECT COUNT Entrants FROM main_event_winners WHERE Year = 2011